Shaping tool for an extruder or calibrator for thermoplastic material

Claim 1

In a shaping device, particularly for an extruder tool or calibrator unit, for an extruder for thermoplastic material comprising at least one outlet-defining adjustable lip and an opposing lip, at least one positioning member acting on said adjustable lip and a control and regulating mechanism for the thickness of the extruded product from said extruder, said positioning member being a part of said control and regulating mechanism and being a piezoelectric translator connected to a voltage source, the improvement wherein said positioning member comprises a plurality of piezoelectric disks positioned opposing each other which are combined in a plurality of groups according to operation and according to electrical circuitry considerations and said groups of said piezoelectric disks individually and in totality being connectable to said voltage source, said positioning member having m of said piezoelectric disks where m=ε(2.sup.x).sub.n x=1,2,3 . . . and wherein n represents the group and is equal to one or an integer greater than one and (2 x ) n is the number of said piezoelectric disks in each of said groups.

Claim 8

A device for shaping a thermoplastic synthetic resin which comprises: a pair of lips defining a gap through which said thermoplastic synthetic resin is passed to impart a dimension to the thermoplastic synthetic resin determined by a spacing between said lips, at least one of said lips being adjustable relative to the other of said lips; means for monitoring said dimension of the thermoplastic synthetic resin emerging from said lips; control means responsive to said means for monitoring for generating a control signal for adjusting the spacing of said lips to control said dimension; and an effector connected to said control means and acting upon said one of said lips for displacing same in response to said signal, said effector including: a stack of piezoelectric translator disks subdivided into groups of mutually juxtaposed disks, means for selectively exciting the disks of each group in parallel simultaneously and jointly, severally and individually exciting the groups as required in response to said control signal to obtain a degree of displacement of said one of said lips required to maintain said dimension at a selected value, and said effector comprising a number n of juxtaposed disks in said stack, wherein m=ε(2.sup.x).sub.n x=1,2,3 . . . and n is an integer at least equal to 1, (2 x ) n representing the number of disks in the individual groups Gn, n=1,2,3 . . . .

Claim 9

A device for shaping a thermoplastic synthetic resin which comprises: a pair of lips defining a gap through which said thermoplastic synthetic resin is passed to impart a dimension to the thermoplastic synthetic resin determined by a spacing between said lips, at least one of said lips being adjustable relative to the other of said lips; means for monitoring said dimension of the thermoplastic synthetic resin emerging from said lips; control means responsive to said means for monitoring for generating a control signal for adjusting the spacing of said lips to control said dimension; and an effector connected to said control means and acting upon said one of said lips for displacing same in response to said signal, said effector including: a stack of piezoelectric translator disks subdivided into groups of mutually juxtaposed disks, means for selectively exciting the disks of each group in parallel simultaneously and jointly, severally and individually exciting the groups as required in response to said control signal to obtain a degree of displacement of said one of said lips required to maintain said dimension at a selected value, and said effector comprising a number n of juxtaposed disks in said stack, wherein m=ε(2.sup.x).sub.n x=1,2,3 . . . and n is an integer at least equal to 1, (2 x ) n representing the number of disks in the individual groups Gn, n=1,2,3 . . . .